| South Portland to Candler-McAfee (Georgia) | 1,015.81 mi (1,634.79 km) |
| South Portland to Caño Martin Peña (Puerto Rico) | 1,758.54 mi (2,830.10 km) |
| South Portland to Cañon City (Colorado) | 1,841.25 mi (2,963.20 km) |
| South Portland to Canóvanas (Puerto Rico) | 1,764.01 mi (2,838.89 km) |
| South Portland to Canton (Georgia) | 998.88 mi (1,607.55 km) |
| South Portland to Canton (Illinois) | 1,031.93 mi (1,660.73 km) |
| South Portland to Canton (Mississippi) | 1,310.89 mi (2,109.67 km) |
| South Portland to Canton (Ohio) | 598.91 mi (963.86 km) |
| South Portland to Canyon (Texas) | 1,780.31 mi (2,865.13 km) |
| South Portland to Canyon Lake (California) | 2,588.90 mi (4,166.43 km) |
| South Portland to Canyon Lake (Texas) | 1,803.54 mi (2,902.52 km) |
| South Portland to Cape Coral (Florida) | 1,344.05 mi (2,163.04 km) |
| South Portland to Cape Girardeau (Missouri) | 1,099.63 mi (1,769.69 km) |
| South Portland to Carbondale (Illinois) | 1,069.78 mi (1,721.65 km) |
| South Portland to Carlisle (Pennsylvania) | 427.04 mi (687.25 km) |
